Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 8: Active Matter DY II (joint session DY/CPP/BP)
BP 8.2: Vortrag
Montag, 12. März 2018, 15:45–16:00, BH-N 243
Effective viscosity of active suspensions — Levan Jibuti1, Walter Zimmermann1, Salima Rafai2, and •Philippe Peyla2 — 1Theoretische Physik I, Universität Bayreuth, 95440 Bayreuth, Germany — 2LIPhy, Université Grenoble Alpes and CNRS, F-38402 Grenoble, France
Micro-organisms usually can swim in their liquid environment by flagellar or ciliary beating. In this numerical work, we analyze the influence of flagellar beating on the orbits of a swimming cell in a shear flow. We also calculate the effect of the flagellar beating on the rheology of a dilute suspension of microswimmers. A three-dimensional model is proposed for Chlamydomonas Reinhardtii swimming with a breaststroke-like beating of two anterior flagella modeled by two counter-rotating fore beads. The active swimmer model reveals unusual angular orbits in a linear shear flow. This peculiar behavior has some significant consequences on the rheological properties of the suspension. We calculate Einstein's viscosity of the suspension composed of such isolated modeled microswimmers (dilute case) in a shear flow. The results show an increased intrinsic viscosity for active swimmer suspensions in comparison to nonactive ones as well as a shear thinning behavior in accordance with our previous experimental measurements.
Effective viscosity of a suspension of flagellar-beating microswimmers: Three-dimensional modeling Levan Jibuti, Walter Zimmermann, Salima Rafaï, and Philippe Peyla Phys. Rev. E 96, 052610 (2017)